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No. 707,397. Patented Aug. I9, |902. C. R. DAVIS.

PATTERN PLATE.

TApplication filed Mar. 25. 1902.) No Model.,`

3 Sheets-Sheet 2.

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No. 707,397. Patented Aug. 19, |902.

C. R. DAVIS.

PATTERN PLATE.

"Application led Mar. 25, 1902.) (No Model.) 3 Sheets-Sheet 3.

OFFICE;

CALVIN It. DAVIS, OF SOUTH BEND, INDIANA, ASSIGNOR'TO OLIVER OI-IILLED PLOW WORKS, OF SOUTH BEND, INDIANA.

PATTERNNPLATE.

SPECIFICATION forming part of Letters Patent No. 707,397, dated August 19, 1902.

Application filed March 25, 1902. Serial No. 99,935. (No model.)

To @ZZ whom, it may concern:

Beit known that I, OALviN R. Davis, of South Bend, in the county of St. Joseph and State of Indiana, have invented certain new and useful Improvements in Pattern-Plates; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

My invention relates to an improvement in pattern-plates, the object of the invention being to provide an improved pattern-plate to which the pattern is removably secured and capable of being replaced when worn.

With this object in view the invention consists in certain novel features of construction and combinations and arrangements of parts, as hereinafter set forth, and pointed out in the claims.

In the accompanying drawings, Figures l and 2 are views of the two plates with the patterns secured thereto. Fig. 3 is a view in section on the line x m of Fig. l, and Figs. 4 and 5 are views of the plates before the attachment of the pattern. Fig. 6 is a sectional View of the plate 2 and pattern secured thereto, and Fig. 7 is a sectional View through both plates after the Babbitt metal has been poured.

l 2 represent the two pattern-plates, and 3 3 the patterns secured therein. In making these plates a plaster cast is taken of both sides of the pattern, thus leaving the casts when together the complete imprint of the pattern. The casts are fitted snugly together and shaped to the required thickness and width and gotten ready for use as patterns to cast the plates from. The plaster cast having the smoothest impression is then used as a pattern to cast metal plate l from, and in the depressions 1l therein, which have the contour of one face of a pattern, the patterns 3 are secured by a bolt or screw 4., screwed through the back of the plate, as shown in Figs. l and 3. The plaster cast from which plate 2 is to be cast is lirst cut out, or, in other words, the recess formed therein by the pattern is enlarged. The recess in the plate made from the plaster cast is cut entirely through, as shown at 6 in Fig. 5, and headed pins 7 are secured all around the edge ofthe impression and the walls thereof grooved or recessed, as shown at 8, to form a key for the Babbitt metal 9, as will now be explained. The pattern 3 being secured on plate l by the bolt 4, plate 2-is then placed on plate l, the pattern being accommodated in the eularged recessed portion thereof. Babbitt metal is then poured through holes 10 in plate 2 and iiows all around the pattern-forming keys in the groove S and around the headed pins 7 and securely locking the pattern therein, as shown in Figs. 2 and 7. The bolt 4.- is then unscrewed from plate l and plate 2 removed,with the pattern secured therein. Another pattern is then secured to plate l, and

the plates are in condition to mold the molds for use. While it is possible that this plate 2 might be cast directly from the plaster cast without altering the latter, still it has been found that, owing to the uneven side of the pattern which is iitted therein, it would cost too much time and labor to fit such yuneven surface therein, and a good true fit would be almost impossible, as one plate is necessarily thinner and more uneven than the other. The two plates will not shrink alike when being cast in metal, so that the plates could not be fitted together face to face with the patterns therein, as one of the impressions taken from the pattern would not come square with the pattern in the opposite plate, and to avoid these difficulties I secure the pattern in plate 2 in the manner above described, which positively assures a perfect fit.

Heretofore in the manufacture of patternplates it has been the practice to split the pattern in half-that is, cast one-half of the pattern onto each plate solid, pattern and plate being integral and in one piece-and when the sharp outlines of the pattern were destroyed by use it was necessary to throw away the plate while the` latter was but little worn, consequently throwing away a great amount of valuable labor. It is also well known that by making theA plates and patterns integral the top and bottom plates necessarily shrink uneven. Thus the two halves of the pattern do not joint up perfectly, and the consequence is that the castings made from the molds from such patterns and plates IOC are uneven or warped. With my improvements all these objections are overcome, as the plates are perfectly fitted before the patterns are secured thereto, and should the patterns become worn they can be readily replaced. The Babbitt metal can be easily removed from plate 2 by driving out the pins 7 from the back, the Babbitt metal following the pins, and the patterns can be removed by melting the soft metal or by other methods, so as to permit a securing of a new pattern to the plate, while the pattern from plate l can be removed by simply unscrewing bolt 4E.

Various slight changes might be resorted to in the general form and arrangement of the several parts described Without departing from the spirit and scope of my invention, and hence I would have it understood that I do not wish to limit myself to the precise details set forth, but consider myself at liberty to make such slight changes and alterations as fairly fallwithin the spirit and scope of my invention.

Having fully described my invention, what I claim as new, and desire to secure by Letters Patent, is*- 1. A pair of cooperating pattern-plates for casting two dierently-formed faces of an article, each plate having depressions conforming respectively to the contour of the faces of the article to be molded, and a pattern removably secured to each of said plates.

2. A pair of cooperating pattern-plates for casting two diiferently-formed faces of an article, said plates having depressions therein conforming respectively to the front and rear faces of the article to be molded, patterns mounted on said plates, each pattern having a contour on one side conforming to the contour of the depression in the plate on which it is mounted and having a contour on its other side conforming to the contour of the depression in the other plate, and means for removably securing said patterns in place on said plates.

3. A pair of cooperating pattern-plates for casting two differently-formed faces of an article and having, respectively, depressions conforming to the contour of respective sides of the article to be cast, one of said plates having a groove surrounding the depression therein, a pattern having a contour for casting one side of an article, located in said depression, Babbitt metal filling the surrounding groove and another pattern having an eX- terior contour for casting the other side of the article, removably secured in the depression in the other plate.

4. A pattern-plate, comprising a plate having a depression therein, and having a groove surrounding said depression, pins located in said groove, a pattern located in said depression and Babbitt metal located in said groove and embedding said pins, said Babbitt metal serving to secure the pattern to the plate.

In testimony whereof I have signed this specication in the presence of two subscribing witnesses.

'CALVIN R. DAVIS. Witnesses:

THoMAs A. FREEMAN, FRANK W. ADAMS. 

